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  <title>D3 Playground</title>
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    <section class="hero is-primary">
      <div class="hero-body">
        <div class="container">
          <h1 class="title">
            D3 Playground
          </h1>
          <h2 class="subtitle">
            各种D3的练习
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    <div class="list is-hoverable">
      <a class="list-item" href="/tree/TidyTreeLayout.html">
        Tidy Tree Layout
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      <a class="list-item">
        TBD
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